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Error code reference

Daewoo Refrigerator Error Code F1

F-sensor (freezer sensor) malfunction due to short circuit or wire disconnection.

Daewoo codesDaewoo refrigerator codes

F-sensor (freezer sensor) malfunction due to short circuit or wire disconnection.

First step from the service manual

Check F-sensor for short circuit or wire disconnection. In error state, compressor & F-fan cycle on for 24 min, off for 16 min (FR-540NT) or refrigerator runs at 60% power with 40-minute period (FR-540N).

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
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What F1 means on a Daewoo refrigerator

The F1 error code on a Daewoo refrigerator indicates a malfunction in the F-sensor, which is the freezer compartment temperature sensor. This sensor is a thermistor that continuously monitors freezer temperatures and sends resistance-based readings to the control board. When the board detects a short circuit or an open circuit caused by wire disconnection, it registers the F1 fault and switches to a protective operating mode rather than shutting down entirely.

On models such as the FR-540NT, the protective mode cycles the compressor and freezer fan on for 24 minutes and off for 16 minutes on a repeating schedule. On the FR-540N, the refrigerator reduces operation to approximately 60% power with a 40-minute cycle period. These degraded modes are designed to maintain some level of cooling while preventing uncontrolled temperature conditions caused by the missing or erroneous sensor signal.

The root cause is typically either a failed thermistor with an internal short or open, a physically disconnected wiring harness connector at the sensor or control board, or damaged wiring in the sensor circuit. Because the sensor is located inside the freezer compartment, it is subject to repeated freeze and thaw cycles that can cause connector corrosion or wire insulation fatigue over time. Diagnosis requires inspecting the sensor and its wiring harness for visible damage and measuring the sensor's resistance to determine if it falls within the expected range for its current temperature.

Source: manufacturer service documentation.

Common causes of F1

  1. 01

    Disconnected sensor wiring harness

    Wiring / connection

    The connector linking the F-sensor to the control board wiring harness may have come loose or detached, creating an open circuit. Inspect the connector at both the sensor end and the board end for secure seating.

  2. 02

    Failed F-sensor (thermistor)

    Part replacement

    The thermistor inside the freezer may have failed internally, producing either a short circuit or an open circuit reading regardless of actual temperature. Resistance measurement of the sensor will confirm whether it is out of specification.

  3. 03

    Damaged or broken sensor wiring

    Part replacement

    The wiring between the F-sensor and the control board can crack or break due to repeated temperature cycling inside the freezer compartment. Visually inspect the full wire run for cuts, pinches, or brittle insulation.

  4. 04

    Corroded sensor connector

    Wiring / connection

    Moisture inside the freezer can cause corrosion at the sensor connector pins, increasing resistance to the point where the control board reads the circuit as faulty. Check connector terminals for oxidation or discoloration.

  5. 05

    Control board fault

    Part replacement

    In less common cases, the control board itself may be misreading the sensor circuit due to a board-level component failure. This is typically diagnosed only after the sensor and wiring have been confirmed to be intact and within specification.

See the test procedure for each cause

Frequently asked questions about F1

What does F1 mean on a Daewoo refrigerator?
F1 on a Daewoo refrigerator indicates a malfunction in the F-sensor, which is the freezer compartment temperature sensor. The fault is triggered by either a short circuit within the sensor itself or a disconnection in the sensor wiring. The refrigerator will continue running in a reduced protective mode, but temperature control will not be accurate until the sensor issue is resolved.
Can I fix the F1 error on my Daewoo refrigerator myself?
If the cause is a loose or disconnected wiring connector, you may be able to reseat it yourself after unplugging the refrigerator and locating the sensor harness. However, if the thermistor itself has failed or wiring is broken, you will need to replace the faulty component, which requires basic electrical diagnostic skills. Measuring sensor resistance with a multimeter and comparing it against the expected value for the current freezer temperature is the key diagnostic step.
Is it safe to keep using my Daewoo refrigerator while F1 is displayed?
The refrigerator will operate in a limited backup mode with F1 active, meaning it continues to run but cannot regulate temperatures accurately. This could result in food being stored at unsafe temperatures over time, particularly in the freezer. It is advisable to check your food for signs of improper temperatures and have the repair completed as soon as possible.
How much does it cost to fix a Daewoo F1 error?
If the fix is simply reseating a disconnected connector, there may be little to no parts cost involved. Replacing a failed F-sensor thermistor typically costs between $15 and $60 for the part, with labor adding $80 to $150 depending on your location and the service provider. If the control board is at fault, repair costs will be higher, generally ranging from $150 to $350 or more for parts and labor.
Will resetting my Daewoo refrigerator clear the F1 error code?
Unplugging the refrigerator and restoring power may temporarily clear the F1 code, but the error will return if the underlying sensor fault is still present. A reset does not repair a failed thermistor, broken wire, or corroded connector. Permanent resolution requires diagnosing and correcting the specific fault in the F-sensor circuit.

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